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Ultrasonic Button Circuit > < Tailgate Switch Locking Circuit

 

 

 

 

C-13, Broken glass alarm signal circuit  

C-13, Broken glass alarm signal circuit  

Test  

Instructions  

Nominal value  

T01  

Measure resistance  

 

 

•  Disconnect wiring harness plug from anti-theft warning system control unit & central door locking K94 (28 pin)  

•  Measure resistance between wiring harness plug X94/terminal 26 and ground  
 
 
 

 
 
Lower than 10 Ω  
 

 

Yes:   E01  

No:   T02  

T02  

Measure resistance  

 

 

Note:  

Lower than 2 Ω  
 

 

Fastback (Model 31),  

 

 

Notchback (Model 36) with rear screen antenna  

 

 

Further test 04,  

 

 

Notchback (Model 36) without rear screen antenna  

 

 

Further test 05  

•  Disconnect wiring harness plug from anti-theft warning system control unit & central door locking K94 (28 pin)  

•  Separate body wiring harness plug & tailgate X23  

•  Measure resistance between wiring harness plug X23/terminal 1 and wiring harness plug K94/terminal 26  
 
 
 

 

 

Yes:   T03  

No:   E02  

T03  

Measure resistance  

 

 

•  Separate body wiring harness plug & tailgate X23  

•  Measure resistance between wiring harness plug X23/terminal 1 and heated rear window input  
 
 
 

 
 
Lower than 2 Ω  
 

 

Yes:   E04  

No:   E03  

T04  

Measure resistance  

 

 

•  Disconnect wiring harness plug from anti-theft warning system control unit & central door locking K94 (28 pin)  

•  Disconnect wiring harness plug from rear window antenna amplifier U18  

•  Measure resistance between wiring harness plug U18 input, black lead, and wiring harness plug K94/ter. 26  
 
 
 

 
 
 
 
Lower than 2 Ω  
 

 

Yes:   E07  

No:   E05  

T05  

Measure resistance  

 

 

•  Disconnect wiring harness plug from anti-theft warning system control unit & central door locking K94 (28 pin)  

•  Measure resistance between heated rear window input and wiring harness plug K94/terminal 26  
 
 
 

 
 
Lower than 2 Ω  
 

 

Yes:   E04  

No:   E06  

 

C-13, Broken glass alarm signal circuit  

No.  

Result  

E01  

•  Anti-theft warning system control unit & central door locking K94 defective  
 
 
 

E02  

•  Interruption in lead between anti-theft warning system control unit & central door locking K94/terminal 26 and body wiring harness plug & tailgate X23/terminal 1  
 
 
 

E03  

•  Interruption in lead between body wiring harness plug & tailgate X23/terminal 1 and heated rear window input  
 
 
 

E04  

•  Heated rear window defective  

 

  or  

 

•  Interruption in lead between heated rear window output and ground  
 
 
 

E05  

•  Interruption in lead between anti-theft warning system control unit & central door locking K94/terminal 26 and antenna amplifier wiring harness plug U18  
 
 
 

E06  

•  Interruption in lead between anti-theft warning system control unit & central door locking K94/terminal 26 and heated rear window input  
 
 
 

E07  

•  Antenna amplifier U18 defective  

 

  or  

 

•  Interruption in lead between antenna amplifier output U18 and heated rear window input  

 

  or  

 

•  Heated rear window defective  

 

  or  

 

•  Interruption in lead between heated rear window output and ground  
 
 
 

 

 


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Ultrasonic Button Circuit > < Tailgate Switch Locking Circuit